Heating furnace



June 4, 1929.

H. MILLER FURNACE HEATING Filed Jan. 30, 1928 Patented June 4, 1929.

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HARRY MILLER, OF ST. LOUIS, MISSOURI, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, OF FORTY PER CENT TO JOHN J; STECHER AND SIXTY PER CENT TO HARRY MILLER, BOTH OF ST. LOUIS, MISSOURI.

HEATING- FURNACE.

Application filed January 30, 1928.

This invention relates generallyto furnaces and, more especially, to a certain new and useful improvementin furnaces of the type that are adapted for heating residences,

buildings, and the like.

My invention has for an object the provision of a down-draft furnace of the type stated whereby combustion is facilitated and the heating efficiency of the furnace increased.

My invention has for another object the provision of a clown-draft heating-furnace which may be cheaply and economically manufactured, which is simple and durable in structure, and which is satisfactory in use wherever found applicable.

And with the aboveand other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts hereinafter described and pointed out in the claims.

In the accompanying drawing,-

Figure 1 is an elevational view, partly broken away and in section, of a heatingfurnace embodying my invention;

Figure 2 is likewise an elevational view, partly broken away and in section, of the furnace; and

Figure 3 is a transverse sectional view of the furnace, taken approximately on the line 33, Figure 1.

Referring now more in detail and by reference characters to the drawing, which illustrates a preferred embodiment of my invention, the furnace proper includes, as is usual, an upright outer shell A commonly, though not necessarily, of cylindrical contour, re-enforced for the most part by an inner wall B preferably of suitable refractory material. Provided upon shell A, are the usual firing-door C and ash-door D, and extending into and from the furnace is a suitable stack or flue E, while leading from the furnace are the usual hot-air or heatingfiues 0.

Now, in my present furnace, I provide longitudinally within the shell A a third wall or battle-plate F which may be of plane or arcuate shape, and solid or hollow formation. which extends preferably from the upper end of shell A to somewhat below the plane of the draft or firing-door opening, and which is so located and fixed within shell A as to divide the interior of shell A into a hot-air space, as at G, and a draft flue as at H, the

Serial No. 250,565.

latter being substantially a continuation of flue E and which extends downwardly within the shell to the plane of the lower end of the wall or plate F, as best seen in F igure 1.

Suitably mounted for rocking movement in shell A, and disposed horizontally of shell A in a plane spaced downwardly from the lower end of wall F, is a grate J of a size preferably to provide merely a so-called bottomwall for the heating-space or chamber G, and disposed transversely of shell A and in the space intermediate the lower end of wall F and the rear end of grate J, is a second grate K vertically disposed relatively to shell A and preferably constructed of communicating water-tubes having connection at one end, as at 1, with a suitable source of water supply, not shown, and leading at the other end, as at 2, to a hot water tank or other exhaust, also not shown.

The grates J and K thus provide a support for coal or other combustible matter M, and as so constructed, the furnace is of down draft type. The ash-door D being normally closed, draft-air enters through the firingdoor opening, is pulled downwardly through the fire-box or combustible matter M, and passes outwardly through the second grate K and the flue-continuation H and stack E. In such manner, I am enabled to effect practically complete combustion with little smoke or other products of combustion. Further, as the cold air duct N leads into the rear of shell A and as the created heat flows towards the rear of the shell, I am enabled at the same time to increase the heating efficiency of the furnace, the hollow bafiie-plate F affording also an enlarged heating area for the cold air.

It will be understood that present day heating-furnaces may be conveniently and inexpensively converted by my invention into down-draft furnaces and thereby obtain the described advantages thereof, and it is also to be understood that changes in the form, construction, arrangement, and combination of the several parts of my new furnace may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a heating furnace, a shell having an exhaust fine and in its side wall a draft-openof the shell, a ballle fixed longitudinally with-' in, and spaced from the wall of the shell, said battle terminating at its lower end intermediate the plane of said draft-opening and the plane of said grate and longitudinally dividing the interior of the shell above the plane of the grate into a heating-chamber and a draft-flue, the latter leading to tne exhaust line of the shell, and an upright grate fixed in the shell and disposed in the vertical plane of the battle intermediate the lower end of the battle and said horizontal grate.

2. In a heating furnace, a shell having an exhaust flue and in its side wall a draft-oped ing, said opening being spaced upwardly from the lower end of the shell, a roekable grate disposed horizontally within the shell and located in a plane intermediate the plane of said draft-opening and the plane of the lower end of the shell, a longitudinally disposed bafile fixed within, and spaced from the wall of the shell, said Wall terminating at its lower end intermediate the plane of said draft-opening and the plane of said grate and longitudinally dividing the interior of the shell above the plane of the grate into a heating-chamber and a draft-tine, the latter leading to the exhaust flue of the shell, and an upright water-tube grate fixed in the shell and disposed in the vertical plane of the battle intern'iediate the lower end of the baiiie and said horizontal grate, said latter grate terminating at its inner end in the vertical plane of the baiile.

In testimony whereof I afiix my signature,

HARRY MILLER. 

